Malicious PDF — malware analysis report

Static analysis result for SHA-256 79385e752c8b3d7a…

MALICIOUS

PDF

51.6 KB Created: 2020-07-08 12:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 74464806f28c9d66bcfde8406e9d2cbd SHA-1: 748f583f67adf09a8ec1053eb249a3a06b7f7025 SHA-256: 79385e752c8b3d7a36274dffebccb43d8c042934cb12681341e8e74225286b82
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to disposable domains and redirect to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the document body, though partially obfuscated, contains text related to downloading free books and includes the malicious URLs. This suggests a link farm or phishing lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=baixar%20pdf%20gratis%20livros In PDF document text
    • http://files.funny-jokes-quotes.com/uploads/1/3/1/6/131636914/kazafekapiforamumad.pdfIn PDF document text
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdfIn PDF document text
    • http://files.campverdecommunitychurch.org/uploads/1/3/0/7/130740232/rafukofaxoj-loramur-zitodat-mudoludi.pdfIn PDF document text
    • http://files.sallysweetland.com/uploads/1/3/1/4/131438249/e377953a8cde1ef.pdfIn PDF document text
    • http://files.farmarcadia.com/uploads/1/3/0/9/130969242/dotasuwora_dazikuna_foxesajezasowa.pdfIn PDF document text
    • http://files.mgtconcepts.com/uploads/1/3/1/4/131453725/pipadejirivuvo_gazugubagaxux_fugaradonebo.pdfIn PDF document text
    • http://files.thenauticalartsworkshop.com/uploads/1/3/1/6/131606035/bikebawifutir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://setiruru.files.wordpress.com/2020/06/bojorivudoxuxuxapusaxa.pdfIn PDF document text
    • https://xoduwataneno.files.wordpress.com/2020/06/50268976726.pdfIn PDF document text
    • https://virebon.files.wordpress.com/2020/06/kufarifagapatevipogim.pdfIn PDF document text
    • https://fojepododur.files.wordpress.com/2020/07/setosutiworabafi.pdfIn PDF document text
    • https://budekukagok.files.wordpress.com/2020/06/6954435894.pdfIn PDF document text
    • https://noratum.files.wordpress.com/2020/06/sabatevipewe.pdfIn PDF document text
    • https://borakav.files.wordpress.com/2020/07/8065821617.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 4952 bytes
SHA-256: 0ea481d09d3c770afe93d428a123062f354a28061b63cd018adb2dc1784e61c2
font_01_sfnt_off00007c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000084b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B2 12012 bytes
SHA-256: 9bc45141ad2632c23e5bbcc2b99a5efe67463f8909a2a4e480e461592a4d0c09
font_03_sfnt_off0000aa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA61 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06

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